●Change8

Migrating to Weights & Biases v0.19.9

Version v0.19.9 introduces 4 breaking changes. This guide details how to update your code.

Released: 4/1/2025

4
Breaking Changes
5
Migration Steps
5
Affected Symbols

⚠️ Check Your Code

If you use any of these symbols, you need to read this guide:

wandb.initwandb.loggerwandb.Api.paginated methodsartifact download URL builderMetaflow integration

Breaking Changes

●Issue #1

The wandb logger is now configured with propagate=False at import time, which can change messages observed by the root logger.

●Issue #2

Metaflow integration now requires the plum-dispatch package; runs will fail if it is not installed.

●Issue #3

Paginated methods that accept a per_page argument now only accept int values; passing None is no longer supported.

●Issue #4

The artifacts API now uses new endpoints that require collection information; custom API calls may break.

Migration Steps

  1. 1
    Replace any boolean values for the reinit setting with the strings \"return_previous\" or \"finish_previous\" (or \"default\").
  2. 2
    If using Metaflow, install the plum-dispatch package.
  3. 3
    Update calls to paginated methods to pass an integer for per_page; remove any None arguments.
  4. 4
    Adjust any custom artifact download code to use the new URL scheme and include collection information.
  5. 5
    Be aware that the wandb logger now has propagate=False at import; modify root logger configuration if needed.

Release Summary

This release adds a default reinit option and a new artifact URL scheme, deprecates boolean reinit values, introduces several breaking changes (logger propagation, Metaflow dependency, stricter per_page handling, updated artifact API), and includes multiple bug fixes.

Need More Details?

View the full release notes and all changes for Weights & Biases v0.19.9.

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